Lighting generator



April 18, 1933 .J. F. MARTIN 1,904,692

LI GHT ING GENERATOR Filed April 6, 1932 2 Sheets-Sheet l I II "III,

EIIIIIII INVENTOR Jab/1 f7 M41771 git/11 b ATTORNEY April 18, 1933. J. F. MARTIN LIGHTiNG GENERATOR Filed Apl il 6, 1932 2 Sheets-Sheet 2 INVENTOR .10/1/1 E Marl /'/1 ATTORNEY I i is particularly;

Patented Apr. 18, 1933 UNITED STATES PATENT OFFICE JOHN F. MARTIN, OF SPRINGFIELD, MASSACHUSETTS, .ASSIGNOR TO UNITED AMERICAN BOSCH CORPORATION, OF SPRINGFIELD, MASSACHUSETTS, A CORPORATION OF NEW YORK Application filed April 6,

This invention relates to improvements in generators; and especially generators to furnish electric current for lighting purposes.

The lighting generator of this invention adapted for use on motor vehicles; and erefore the object of the illvention is to provide a lighting generator which is simple and efficient in construction and operation, easy to install and remove, of

little weight and capable of being readily taken apart for examination and repair.

The nature and the advantages of the invention are fully set forth in the following description, in connection with the accom- 15, panying drawings which disclose a preferred form in which the prmciple of the invention is embodied. The disclosure, however, is illustrative only, and variations in the shape, size and arrangement of the various parts can be made in practice without exceeding the scope and meaning of the terms in which the appended claims are expressed.

On the drawings:

Fig. 1 is an end view partly in section on the line 1-1 in Fig. 2 of a lighting generator according to this invention;

Fig. 2 is a vertical, longitudinal section on the line 2-2 of Fig. 1;

Fig. 3 is a top plan of a detail;

Fig. 1 is a top view vation of part of the generator which contains an armature chamber; and Figs. 6 and 7 are similar views of a complementary part.

On the drawings the same numerals identify the same parts throughout.

The numeral 1 indicates one or more permanent magnets mountedon the lower part 2, which is hollow and supports a rotatable shaft 3 surrounded by a stationary generating coil 1. The chamber within the part 2 also contains the rotor 5 which is mounted on the shaft 3 and rotates therewith; the generator thus being of the fixed coil and rotating in ductor type. The leads of the coil pass out through an opening in the top of the part 2 and are oined to terminals or binding posts 6 by which the ends of conductors of an outside circuit can be attached to the coil 1. The housing 2 is preferably made up of two parts or sections fitted together in a plane transand Fig. 5 an end ele- 1932. Serial no. 603,483.

verse to the shaft 3, said sections being indicated by the numerals 7 and 8. These sec tions are held together, partly by the engagement of the magnets with the upper part thereof, and partly by screw bolts 9 which pass through holes 10 in the front section 7 into alined threaded bores 11 in the rear'section 8 and the front ends of the bores 11 may be flared slightly to enable the screws 9 to pass readily into them. The polepieces for the magnets are indicated at 12 in the top of the housing 2 and these polepieces are likewise in sections; 120. forming part of the sec tion 7 and 12?) forming part of the section 8;

the sections 12av and 12?) on each side of the generator matching and coinciding to form a complete pole-piece at each side, extending from front to back over the entire width of the magnet 1 when the sections are secured together.

The front section 7 has an opening 13 for the shaft 3, a shouldered seat 14 of larger diameter than the opening 13 and an enlarged shouldered recess '16. Against the seat 14 is placed a felt packing 17 and the recess 16 receives an anti-friction bearing 18. Similarly, the rear section 8 has a seat 15 for the packing 17 and a similar shouldered recess concentric with the seat 15 for another anti-friction bearing to engage the rear or inner end of the shaft 3; but the section 8 has no opening for the adjacent end of the shaft 3 which does not project through this section. For the seat 15 and recess 16, the section 8 has a boss 19; and a similar boss 20, concentric with the shaft opening 13, is formed on the outer face of the front section 7.

The two sections 7 and 8 are thus approximately box-shaped and are closed at the bottom, top, sides and one end except for the opening 13 in section 7. Preferably these sections are made in the form of lightaluminum castings and the sections 12a and 12b of the polepieces are set into the mold when the casting operation is performed, so that the metal of the two sections 7 and 8 closes around their lower parts and secures them in place on cooling. For this purpose they have the shape plainly shown in Figs. 1, 5 and 7 and have projections 21 adjacent their lower ends which serve as tongues and are provided with protruding edges, such that as soon as the aluminum flows around these tongues the polepieces cannot be displaced. The rear section has a projecting fit ring 22 interrupted at the top and bottom to enter and engage a shouldered enlargement 23 in the adjacent face of the open end of the front section 7. This fit ring 22 enables the two sections 7 and 8 to be alined properly before the fastening bolts 9 are inserted into the holes 10 and 11 and tightened. The interior of the housing 2, when the sections 7 and 8 are secured to each other, is thus completely sealed, except for the opening 13 and an opening in the top to be described later. This interior as shown in Figs. 1, 5 and 7 is substantially cylindrical with an extension at the top due to the fact that the polepieces 12 must have a non-mag netic space between them. Besides being formed with closed ends, the sections 7 and 8 are so cast that the metal thereof bridges the polepieces 12 at the top also.

The rotor 5 in the chamber comprises two sections 24 and 25. Each of these sections is made up of laminations having the general shape indicated in Fig. 1 and the laminations of both sections are parallel to the axis of the shaft 3. The assembled laminations of each section are fixed to the shaft 3 by rivets or studs 26, and it will be seen from Figs. 1 and 2 that the sections 24 and 25 are at right angles to each other. At the sides of each bundle of laminations are cover plates 27 and 28 firmly clamped by the rivets 26. The sections of the rotor have their outer ends rounded and are of about the same width as the width of the polar faces of the polepieces 12, so that the magnetic flux through the coil 4 can easily be controlled.

In the chamber containing the rotor 5, the generating coil 4 is faced on both sides with brass or the like material 29, which may be lined with insulating sheets of cloth or paper, shown at 80. The sheets 29 and 30 may be circular or have some other desired shape and are, of course, perforated, so that they give clearance to the rotor 5. The tops of the two sections have recesses 31 which register and form an opening 31 through which the upper portions of the sheets 29 and 30 may project, these upper portions being suitably shaped for the purpose; and the protruding portions of the sheets 29 may be bent down flat against the tops of the sections 7 and 8 and secured by the screws 32. Covering this opening is a hollow insulator or hood 33 having projections at its front and rear ends with openings for screws 34, the insulation 29 lying between the insulator 33 and the top of the housing 2. This insulator mounts the terminals 6; and the sheets 29 and 30 prevent any leakage or loss of current from the terminals of the coil connected to the posts 6, to the housing 2. To afford a seat for the insulator 33, the tops of the sections 7 and 8 may be raised somewhat as indicated at 35a and 35b in Figs. 4 and 6.

The insulator sheets 29 may receive a sleeve of similar insulating material 36 in their central. perforation to lie between the coil 4 and rotor 5. The lower edges of these sheets 29 and 30 may also be bridged and connected by the metal bridge 37 which may project into a trough 38 at the bottom of the housing 2, so as to hold the coil steady.

The magnets are secured to the polepieces by screws 40 and this assists the bolts to hold the parts 7 and 8 together and the sections 7 and 8 may have arts forming flanges 41 at the bottom to en. le the generator to be bolted to a suitable support.

The laminations of the sections 24 and 25 of the rotor are extended on one side, so that they meet along their edges in the central P35 plane of the coil 4, as shown at 42, although these edges cross each other. In operation when the rotor is in the position, shown in Fig. 1, the magnetic flux passes from the polepieces 12 at the left through the rotor in the direction of the shaft 3 and through the coil to the polepieces 12 at the right. When the rotor is turned degrees, the flux passes through the polepieces at the left and through the rotor along the shaft in the opposite direction to the polepieces at the right and thus the magnetic flux is reversed through the coil four times in each revolution.

The generator is thus exceedingly serviceable and at the same time is compact and light 0 in weight as is required for automotive installation. The device can be taken apart any time by removing the screws 9, 32, 34 and 40.

Having described my invention, what- I claim as new and desire to secure and protect by Letters Patent in the United States is:

1. A generator comprising a housing, magnets and polepieces supported by the housing, a shaft mounted in the housing, a rotor on the shaft, said rotor comprising sections at right angles to each other, said sections being made up of laminations parallel to the plane of the shaft, the laminations of each section being extended on adjacent sides so that they abut each other with their edges extending cross-wise, the rotor being continuous from end to end on said shaft and a generating coil in said housing whose output is controlled by said rotor.

2. A generator comprising a housing, magnets and polepieces supported by the housing, a shaft mounted in the housing, a rotor on the shaft, said rotor comprising sections at right angles to each other, said sections being made up of laminations parallel to the plane of the shaft, the laminations of each section being extended on adjacent sides so that they abut each other with their edges extending crosswise, the rotor being continuous from end to end on said shaft and a generating coil in said housing whose output is controlled by said rotor, said coil surrounding the extended portions of the sides of said rotor and the meeting edges of the laminations of the rotor lying in the central plane of the coil.

3. A generator comprising a housing, magnets and polepieces supported by the upper portion of the housing, a shaft mounted in the housing, a rotor on the shaft, a coil in the housing surrounding the shaft and a portion of the rotor, the top of said housing having an opening for the leads to the coil, a hollow insulator hood secured to the top of the generator over said opening, and terminals forming binding posts carried by said insulator hood.

4. A generator comprising a housing, polepieces and magnets carried by the upper portion of the housing, a shaft carried by the housing, a rotor on the shaft, a coil surrounding the shaft and part of the rotor, insulating covers for the two sides of the coil and the opening therethrough, and means at the top and bottom of said housing to engage and hold said insulating coverings in position.

5. A generator comprising a housing, magnets and polepieces carried by the upper portion thereof, a shaft mounted in the housing, a rotor on the shaft, a coil having a central opening surrounding the shaft and the rotor, insulating coverings for the sides of said coil and the interior of said opening, the lower part of the housing having a troughshaped recess, and means secured to said coverings extending into said recess, the upper part of said housing having an opening through which the upper parts of said insulation extend and means for clamping the projecting portions of said insulation down against the outer surface of the top of the housing.

6. A generator comprising a housing, magnets and polepieces carried by the upper portion thereof, a shaft mounted in the housing, a rotor on the shaft, a coil having a central opening surrounding the shaft'and the rotor, insulating coveringsfor the sides of said coil and the interior of said opening, the lower part of the housing having a troughshaped recess, and means secured to said coverings extending into said recess, the top of said housing having an opening through which the upper parts of said insulation project, the leads of said coil extending through said top and an insulator having binding posts to which said leads are attached, said insulator being fastened to said top over the projecting ends of the insulation of the coil.

7 A generator comprising a housing made up of sections with closed top, bottom, sides and one end and with the opposite end open and provided with means to enable the sections to be fitted together and secured to each other in a transverse plane, each section having means for mounting a shaft and enclosing a chamber, polepieces in sections embedded in each section of the housing at the upper part of the sides thereof and registering to form complete polepieces when the sections of the housing are assembled, said polepieces being separated by an extension of the chamber and being bridged at the top with the outer sides exposed, magnets in the housing in contact with the outer sides of the polepieces, means for securing the magnets and polepieces together, a rotor on the shaft in the housing, a stationary generating coil in the housing having a central opening surrounding said shaft and rotor, the top of the housing having an opening for the leads of the coil, insulation in the housing covering the opposite faces of the coil and lining the opening therein, means attached to said insulation and engaging the bottom of the housing, the upper part of said insulation extending through the opening in the top and being laid down on the outer face of the top, a hollow insulator engaging the top and said insulation and carrying binding posts to which the leads are connected and means engaging said insulation and holding said in sulator in place. 4

8. A generator comprising a housing, polepieces and magnets carried by the upper portion of the housing, a shaft carried by the housing, a rotor on the shaft, a coil surrounding the shaft and part of the rotor, insulating covers for the two sides of the coil and the opening therethrough, means at the top of the housing to secure said insulating covers, the lower part of the housing having a recess and means engaging said covers extending into said recess, to hold the covers in place.

In testimony whereof I affix my signature.

JOHN F. MARTIN. 

